Power-press



E. w. ZEH.

POWER PRESS. APPLICATION FILED NOV. 12 1917.

Patented Aug, 10, 1920.

6 SHEETS-SHEET I.

l/Vl/ENTOR. diam ATTORNEYS.

WITAIIESS E. w. ZEH.

POWER PRESS.

ArPucAfxon FILED Nov 12, 1917. Patented Aug; 10 1920.

6 SHE TSSHEET 2- WITNESS: INVENTOR,

ATTOR/VEY8 vE. W. ZEH. I

, POWER PRESS.

APPLICATION men NOV. I2. 1917.

Patented Aug. 10 20.

6SHEEISSH' 3.

IN VE/V TOR.

. Maw-22% A TTORNEYS,

E. W. ZEH.

POWER PRESS.

APPLICATION FILED NOV-12,1917.

1 349,0 3 Patented Aug. 10, 1920.

6 SHEETSSHEET 5.

Fig. 6.

WITNESS mmvron;

E. W. ZEH.

Patented Aug 10, 1920.

6 SHEETS-SHEET 6.

F i g. 10.

2e 0 25 F1 a O 0 F1 11-. o k f WITNESS cSWGL M BY ATTORNEYS.

UNITED STATES PATENT OFFICE.

' EDMUND w. znn, or NEWARK, NEWJERSEY.

POWER-PRESS.

Application filed November 12, 1917.

resident of Newark, in the county of Essex and State of New Jersey, haveinvented new and useful Improvements in Power-Presses, of which thefollowing is a specification.

The objects ofthis invention are to provide in a power press improvedmeans which will yield if pressure of the slide or ram toward the lowerdie exceeds a certain limit, and thus prevent damage or breakage; toprovide for this purpose means which not only resist separation of thehinged members but also tend to restore them to their initial position;to provide the hinged ends of said members with projections extending inthe same direction and provided with means for resiliently tending tohold them in abutment; to more specifically provide said arms with a rodextended through them both and having at one or both of its ends acompression spring abutting against the adjacent arm so as to exert thedesired spring pressure; to arrange said hinged parts in such a mannerthat rotation of the crank to oscillate the pitman will tend to assistyielding of the pitman under excessive load; to provide means for takingup wear at the hinge joints; to provide im proved means for adjustingthe slide or ram with respect to the pitman, and locking the same infixed position; to counteract the lateral thrust of the down stroke uponthe slide or ram; to secure simplicity of con struction and operation,and to obtain other advantages and results as may be brought out in thefollowing description. Referring to the accompanying drawings, in whichlike numerals of reference indicate the same parts throughout theseveral views,

Figure 1 is a perspective view of a press embodying my invention;

Fig. 2 is a side elevation of my improved pitman, in normal position.the crank and slide or ram at its opposite ends being in section;

Fig. 8 is a similar view showing the hinged parts of the pitman afteryielding as they would under excessive pressure;

Fi 4 is a detail central section through the pitman, taken upon avertical plane from front to rear of the press, showing the reSpecification of Letters Patent.

Patented Aug. 10, 1920.

Serial No. 201,690.

lation of the pitman sections to their pivotal pins;

Flg. 5 1s a front v1ew of a portion of the press with the pitman and itshinge joints in section;

Fig. 6 is a cross-section online 66 of Fig. 5;

Fig. 7 Fig' 5;

Fig. 8 is a perspective view of a certain adjusting nut;

Figs. 9 and 10 are vertical sectional views corresponding to Figs. 2 and3 showing a is a cross-section on line 77 of modified construction withthe parts in normal and yielded positions respectively, and

Figs. 11 and 12 are similar sectional views of another modification ofconstruction.

In the specific embodiment of the invention shown in said drawings, 1indicates the frame of a press having a pitman 2 connected to a slide orram 3 adapted to work up and down in slideways 4: and being actuatedfrom a crank shaft 5 in the upper part of he press frame, said crankshaft being shown as driven through a gear wheel 6 meshing with a pinion7 on a driving shaft 8, provided at the opposite side of the press witha fly wheel 9 and belt pulleys 10. It is to the means connecting saidslide or ram 3 to the crank shaft 5 that my present invention moreparticularly relates, and the improvement which I have invented consistsin constructing said connecting means so that it will yield laterally,or break, in event of the pressure exceeding a predetermined limit. Theslide and crank shaft may be of any suitable and well-knownconstruction, my improved pressure limiting means being containedentirely in the pitman or connecting rod extending between said crankshaft and slide or-ram.

In carrying out my invention, I form said pitman or connecting rod insections 11 and 12 which are connected at their ends away from eachother to the crank shaft and slide and at their adjacent ends are hingedtogether as will be described more fully herein. These sections 11 and12 have at their adjacent pivoted ends and in the plane of saidpivoting, which is a plane perpendicular to the crank shaft, extensionsor arms 13, 14 which are substantially parallel and adapted to becontiguous when the pitman sections are in normal alined position, asshown in Fig. 2. Spring means are pro- 'vided to hold the arms 13 14 inabutment i may vary widely without departing't'rom the spirit and scopeof my broad invention. 1

have shown in Figs. 2 and 3 a rod 15 passing through said arms 13,14perpendicular thereto and provided on the outer opposite sides of thearms with helical springs 16, 17 which seat against stops at theopposite ends of the rod. The springs are tensioned' so as to hold thearms together and the pitman sections in alinemont until aeertainpressure limit is reached when they will yield and allow the arms toseparate'and the pitman sections to swing upon their pivotal connection,or break, as shown in Fig. 3. 7

By my improved construction the springs act, after the pitman sectionshave broken or yielded, as shown in Fig. 3, to return the same toinitialposition, and thus not only do the pitman sections return intoalinement as soon as the excess pressure is relieved, but furthermore,they always ex ert pressure, even after the pitman sections have yieldedor broken. to resist further separation. Also the further the armsseparate the more the springs are compressed and thus the greater is thepressure tending to resist further separation and to restore the arms toinitial position.

It will be noted from Fig. '2 that the centers'of the hinge connectionof the pitman sections and the pivotal connection of the pitman to theslide or ram are elf-set or displaced'laterally to opposite sides of avertical line through the centerof the crank shaft, and thus the pitmansections break or yield hingedly with an initial pressure which is notgreatly in excess of the pressure required to force the arms and i lapart against the power of the springs 16 and 17. Furthermore, the arms13, 14- project from the pit nan in the direction toward which thecrankshatt 5 moves at the lower portion of its circular path, indicatedby the arrow in Fig. 3, so that the turning .fric tion ot'the crankshaft upon the pitman, and which is obviously greatest when the pressureis near the limit, is taken advantage of to break the pitman. By thesemeansthe initial pressure required to open the pitman sections is not sogreatly in excess of that required to compress the springs whichnormally hold the arms 13, it together, and thus the device works easilyand gradually..

Obviously, instead of the two springs shown in Figs. 2 and 3 I couldemploy only one, with a tension or strength equal to the two, the rodbeing loosely connected to the springless arm in any suitable manner. InFigs. 9 and 10 I have shown arms 19 and 9 near the opposite ends oi thepitman sections. with a helical spring 20 between their outer ends andconnected thereto, so that when the pitman is broken the said spring iselongated, as shown in, Fig. 10. At other times it holds the pitmansections in alinement, as shown in Fig. 9, stops 21, 22 being providedto limit the action of the spring. In Figs. 11 and 12 a yoke 23 ismounted upon the pivotal connection of the pitman sections, and againstthe outer middle portion of this yoke bears one end of a spring 24, theother end of which bears against a plate 25 which is'connected by links26, 26 to the pitman sections near their ends away from each other.struction breaking of the pitman compresses the spring 2at, as shown in12, so that under normal pressure holds the pitman sections inalinement, as shown in Fig. 11. Various other constructions of springmeans for holding the pitman sections normally in alinement may beemployed, as desired, without departing from my invention.

In order to take up any looseness which may arise in the pivotalconnections of the pitman sections to each other and ot' the pitman tothe slide or ram, I have provided both of said joints with adjustingmeans. which are substantially alike for both or" them so'that only oneneed be described in detail. Takingthe one the lower end of the pitman,where it is pivoted to the slide, it will'be understood that thepressure is borne by the central portions of the end of the pitman andthe slide, a pivot pin 27 lying between said portions and receiving thepressure, since'the said parts are cut away at the opposite sides of thepin as shown in Fig. 4, more particularly. For connecting the pitman tothe slide so that the latter will be raised with the pitman, the pitmanhas as its lower end cars 28, 28, which overlap downward at the sides ofthe slide and the slide has cars 29, 25) which extend upward betweensaid ears ou the itman. The pivot pin 2'? is k yed to one of said' ears29 of the slide so that it cannot turn, and said pivot pin haseceentrically reduced ends 30, 30 receivingeccentric sleevesBl, whichfit within the cars 28 ot the pitman. Obviously who wear causes anylooseness between the pitman and slide upon the upper side of the pivotpin,

Obviously by this centurning said eccentric sleeves 31, 31 in unisonwill shift the pivot pin upon the pitman taking up such looseness andmerely sliding the slide or ramupward with respect to the 'pitman andits ears 28. In order to more the eccentric sleeves in unison they haveradial arms 32 with arcuate slots 33 at their.

As stated, the adjusting means for the joint between the pitman sectionsis similar to the one just described, a pivot pin 36 lying between thetwo sections and receiving ears 3?, it? on the lower section whichproject upward between ears on the upper se len. is not necessary atthis oint to cut away the ends oi the pitman sections ,on both sides oithe pivot pin, asat the .which receive a bolt id extending through saidslots and the lower pitman section so that the arms may be clamped bynuts d5 on the ends of said bolt.

Of course in use ot the press it is necessary to adjust the slide or ramwith respect to the pitman, and to provide for this I have shown theupper part of the slide having a bushing l6 which receives the stem or"the hinge member at the bottom of the pitman so that by turning saidsleeve the slide or ram can be moved toward or away f om the pitmanwithout turning either said slide or pitman. Preferably the said bushing46 is threaded exteriorly to hit a socket 4"? in the slide'or ram andthreaded interiorly to fit the stem 48 of the pitnian hinge member, theinner and outer threads of the bushinq differing so to produce dilerential screw, preferably one which will permit line and accurateadjustment. To this end, the internal and external threads may be otdi'l'lerent kind, that is, one right hand and the other left hand, orthey may be only of different pitch, or they may differ inboth kind andpitch, as desired. The upper end 429 of the bushing is provided withsuitable means for turning it, such as vthe sockets to receive a spannerwrench or the like, and there are also provided means for locking; thesleeve against any rotary movement alter the parts are properlyadjusted. l have provided such locking is by splitting the bushing ll)longitudinally and making its socket in the slide or .m in two parts, asshown in Fig. 7, the movable part being adapted to be clamped toward thefixed part by clamping screws 52, 52 or the like. Thus when the desiredadjustment has been secured, said movable side portion 51 is clampedfirmly against the split linshin a6, closing the same upon the stem andlocking all said parts against any relative movement.

The head of the hinge member 3%, it

will be understood, has the ans 2.), 29 which connect to the pitman, andsaid head at its rear side is .apted [it against the back wall of theslide or ram as at 5%- in Fig. 6 more especially. This supports thehinge member against lateral strain, and more particularly against thelateral strain which occurs when the pitman is approaching its lowervertical position, at the end oi the down stroke. t is this back 55 ofthe slide or rain which forms at its opposite edges the slides 56, 56 onwhich the ram moves up and down, and said back being extended upward asshown in the drawings both the ram and the connection of the pitman tothe same are well adapted to resist the lateral strain which occurs asabove stated.

In order to prevent the hinge memlfier 3st of the slide or ram "from anytendency to turn when the hushing 456 is adjusted, said rear side of thehinge member which bears against the back 55 of the slide or ram isprovided with a tongue 5'? which travels in a vertical groove 58 of saidback, see Figs. 3, 4 and 6.

Obviously detail modifications and changes may he made in manufacturingmy improved power press without departing from the spirit and scope ofthe invention, and I do not wish to be understood as restricting myselfexcept as required by the followin claims when construed in the light oithe prlor art.

Having thus described the invention, what I claim is:

l. The comhination of p tinan comprising sections hinged together, armson the hinged ends of? said sections projecting ad jacent each other. arod eiztending slidahh through said arms and secured against withdrawal,and compression sprin 's one between each arm and the end of :he rod.

2. In a power press or the like, a crank, a pitman comprising sectionshinged together. arms on the hinged ends (Vi said sections pmjectingadjacent each other in he directmn of movement or" the crank at the endoi working strok a rod extending slidably through said arms, and compresion springs on said rod outside the arms.

3. ln a power press or the like, crank, a pitman comprising sections hintogether, arms on said sections projtotinglaterally her rom in thedirection of movement of the crank at the r-oinpletion oi a WOLl-ZlUQjstroke, and means on said arms resilien resisting separation of them andtending to return them to initial relation when separated,

l. In a power press or the like, a crank, a pitman comprising; sectionshinged together to bend in the direction of movement of the crank at theend of a working stroke, and means upon said sections ape carriedthereby for resiliently resisting bending of the liO lie

sections and tending to restore them to initial position when bent.

5. In a power press or the like, the combination with a crank, ofmembers adapted to be reciprocated thereby, a hinge pin between theadjacent endsof said members holding their central portions out ofengagement with each other, overlapping ears on said members at oppositeends of the hinge pin, said ends being reduced eccentrically, andeccentric sleeves on said reduced ends in said ears, whereby wearbetween the members and hinge pin may be taken up by turning saidsleeves.

6. In a power press or the like, the combination with a crank, ofmembers adapted to be reciprocated thereby, a hinge pin between theadjacent ends of said members holding their central portions out ofengagement with each other, overlapping ears on said members at oppositeends of the hinge pin, said ends being reduced eccentrically, andeccentric sleeves on said reduced ends in said ears, and means forlocking said sleeves.

7. In a power press or the like, the combination of a crank, a pitmancomprising hinged sections adapted to yield under excessive. pressure, aslide or ram hinged to said pitman, a hinge pin between the adjacentends of the members of one of said pairs of hinged members holding theircentral portions out of engagement with each other, overlapping ears onthe members of said pair at opposite ends of the hinge pin, said endsbeing reduced eccentrically, and eccentric sleeves on said reduced endsin the ears of one member.

8. In a power press or the like, the combination of a crank, a pitmancomprising hinged sections adapted to yield-under excess1ve pressure, aslide or ram hinged to said pitman, hinge pins between the adjacent endsof the members of each of said pairs of hinge members holding theircentral portions out of engagement with each other, overlapping ears foreach pair of members at opposite ends of their hinge pin, said endsbeing reduced eccentrically, and eccentric sleeves on the reduced endsof each hinge pin in the ears of one member.

j 9. In a power press or the like, the combination of a crank, a pitman,a slide or ram, a hinge pin between the adjacent ends of saidpitman andslide orrani holding their central portions out of engagement with eachother, overlapping ears on said members at opposite ends of the hingepin, said ends being reduced eccentrically in the ears of one member,and eccentric sleeves on said reduced ends. j

10. In a power press or the like, the combination of a crank, membersadapted to be reciprocated by said crank, a hinge pin,

between the adjacent ends of said members holding their central portionsout of engagement With each other and being rotatably fast with respectto one of them, overlapping ears on said members at opposide ends of thehinge pin, said ends being reduced eccentrically in the ears of onemember, and eccentric sleeves on said reduced ends.

11. In a power press or the like, the combination with a crank, a pitmancomprising hinged'sections adapted to yield under excessive pressure, aslide or ram for said pitman, a hinge pin between the adjacent ends ofthe members of one of said pairs of hinge members holding their centralportions out of engagement with each other and rotatably fast withrespect to one of the members, overlapping ears on the members of saidpair at opposite ends of the hinge pin, said ends being reducedeccentrically of one member, and eccentric sleeves on said reduced ends.

12. In a power press or the like, the combination of a crank, a pitman,a slide or ram, a hinge pin between the adjacent ends of said pitman andslide or ram holding their central portions out of engagement with eachother and being fast with respect to one of them, overlapping ears onsaid members at opposite ends of the hinge pin, said ends being reducedeccentrically in the ears of the pitman, and eccentric sleeves on saidreduced ends. 7

13. In a power press or the like, a pitman, a slide or ram having asocket, a hinge member at the end of said pitman With a threaded stemextending into said socket, and a sleeve on said stem in said socketthreaded interiorly and exteriorly to engage the same and move themlongitudinally with respect to each other when the sleeve is rotated.

1a. In a power press or the like, a pitman, a slide or ram having asocket, a hinge member at the end of said pitman with a threaded stemextending into said socket, a sleeve on said stem in said socketthreaded interiorly and exteriorly to engage the same and move themlongitudinally with respect to each other when the sleeve is rotated,and means for l cking said sleeve against movement.

15. In a power press or the like, a pitman, a slide or ram having asocket with part of its lateral wall movable, a hinge member at the endof said pitman with a threaded stem extending into said socket, a sleeveon said stem in said socket threaded interiorly and exteriorly to engagethe same and move them longitudinally with respect to each other Whenthe sleeve is rotated, andmeans for clamping said movable part of thesocket wall against said sleeve.

'16. In a power press or the like, a pitman, a slide or ram'having asocket, a hinge member at the end of said pitman with a threaded stemextending into said socket, a split sleeve on said stem in said socketthreaded interiorly and exteriorly to engage the same and move themlongitudinally with respect to each other when the sleeve is rotated,and means for clamping said split sleeve.

17. In a power press or the like, a pitman, a slide or ram having asocket with part of its lateral wall movable, a hinge member at the endof said pitman with a threaded stem extending into said socket, a splitsleeve on said stem in said socket threaded interiorly and exteriorly toen-.

gage the same and move them longitudinally with respect to each otherwhen the sleeve is rotated, and means for clamping said movable part ofthe socket Wall against said sleeve.

18. In a power press or the like, a pitman, a slide or ram having anupward extension at its back or side opposite that from which the pitmanis brought into vertical position at the endv of its working stroke, anda member connecting the end of the pitman adjustably to the slide orrain and having a bearing against said upward extension of the same,whereby the strain upon said member in bringing the pitman into verticalposition is resisted.

19. In a power press or the like, a pitman, a slide or ram having anupwardly extending guideway at its back or side opposite that from whichthe pitman is brought'into vertical position at the end of its workingstroke, and a member connecting the end of the pitman adjustably to theslide or ram and engaging said guideway to laterally support it againstthe strain in bringing the pitman into vertical position.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

EDMUND WV. ZEH.

Witnesses:

HOWARD P. KING, JANET A. AYnRs.

